Well I found there to be far fewer plot holes in IM, I gotta say. Basically I found only a couple:

1: Stark survives the crash in the sand in the Mark 1 armor(that should've killed him, even with the armor on).

2: Stane figured out how to work the Iron Monger armor way too fast even though being over-sized it should be more difficult to get used to than Iron Man's armor(which took Tony, who's even smarter, a while to get used to).